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Fair Value of Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2016 | Apr. 01, 2017 | Dec. 31, 2016
Level 1 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Total Assets |  |  | $ 3 | $ 10,024
Level 1 | Money market funds |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents |  |  | 3 | 10,024
Level 3 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Contingent consideration | $ 549 | $ 773 | 3,455 | 549
Total Liabilities |  |  | $ 3,455 | $ 549
Summary of changes in contingent consideration liability |  |  |  |
Beginning Balance | 549 | 773 |  |
Acquisitions | 2,898 |  |  |
Remeasurement of acquisition-related contingent consideration | 1 | 71 |  |
Payments |  | (292) |  |
Effects of foreign currency translation | 7 | (3) |  |
Ending Balance | $ 3,455 | $ 549 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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